snusmumriken:
jonwwwo, have you made any further progress with these things?I have exactly the same issue (clock remembers only time at last power down, but increments it correctly from there) and it isn't fixed by either soldering down the xtal case or by your power cycling. The coin cell in the device seems good.
I am on the verge of committing to 100 RTC units of some kind or another, and it would be a big saving if these cheap boards can actually be used. So your latest conclusion would be really helpful!
Yeah, in the end, my solutions only worked for some of the modules... In my opinion, these modules are crap and not worth your time. If i were to do this project again but still needed to save money id try something like these:
They are simpler, no memory module, and may not have the same issues. But let me reiterate, ive never used these so i dont know if they work any better.